/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionForLoop.h
class UMaterialExpressionForLoop : public [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression)
FExpressionExec...
Completed
FExpressionInpu...
EndIndex
FExpressionInpu...
IndexStep
FExpressionExec...
LoopBody
FExpressionInpu...
StartIndex